Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image in a sequence for a display screen or portion thereof with transitional graphical user interface showing our new design;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is the fourth image thereof;

FIG. 5 is a fifth image thereof;

FIG. 6 is a sixth image thereof;

FIG. 7 is a seventh image thereof;

FIG. 8 is an eighth image thereof;

FIG. 9 is a ninth image thereof;

FIG. 10 is a tenth image thereof;

FIG. 11 is an eleventh image thereof;

FIG. 12 is a twelfth image thereof;

FIG. 13 is a thirteenth image thereof;

FIG. 14 is a fourteenth image thereof;

FIG. 15 is a fifteenth image thereof;

FIG. 16 is an enlarged view of FIG. 2;

FIG. 17 is an enlarged view of FIG. 3;

FIG. 18 is an enlarged view of FIG. 4;

FIG. 19 is an enlarged view of FIG. 5;

FIG. 20 is an enlarged view of FIG. 6;

FIG. 21 is an enlarged view of FIG. 7;

FIG. 22 is an enlarged view of FIG. 8;

FIG. 23 is an enlarged view of FIG. 9;

FIG. 24 is an enlarged view of FIG. 10;

FIG. 25 is an enlarged view of FIG. 11;

FIG. 26 is an enlarged view of FIG. 12; and,

FIG. 27 is an enlarged view of FIG. 13.

The outer evenly-spaced broken lines in FIGS. 1-15 depict a display screen or portion thereof and forms no part of the claimed design. The remaining evenly-spaced broken lines in the figures depict portions of the graphical user interface and form no part of the claimed design. The dot-dash broken lines in the figures represent the bounds of the claim and form no part of the claimed design.

The appearance of the animated user interface sequentially transitions between the images shown in FIGS. 1-15. The process or period in which one image transitions to another forms no part of the claimed design. 

CLAIM We claim the ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described. 